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9" number for wheel guide?

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Ted Waltman

9" number for wheel guide?

Post by Ted Waltman » Sat Feb 18, 2012 9:16 am

Ok, I have to ask where the 9" recommended # comes from.

Also, what's the maximum potential "give" on the mains in the event of a
hard landing (not by me of course--just theoretically)?

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne G. O'Shea
Sent: Monday, May 24, 2004 6:48 PM
To: murphy-rebel@dcsol.com
Subject: Re: Tailwheel / prop clearance


No, I do have the newer 3500 legs (and use the 2500 legs as forks on my
backhoe bucket for moving pallets around the yard!). I have no idea of
what I will have for prop clearance and not too concerned at this point
...as I may not be using MAM's gear legs anyhow. You know me better than
that and my "liking" for spring gear (on ANY airplane)! :o)

I may be wrong, but I was lead to believe that the two blade M14 prop
(like Bill brought to show us last week!) was only about 94 or 96" long.
It's the M462RF's 2 blade metal prop that I have.. that is 106-1/4" long
and pretty sure we discussed it before as being at least 10 inches
longer than the 2 blade that MAM originally ran on the Prototype.

As long as Ted jacks the tail up and gets more than 9" he should be good
to go. Subtract from the 9" or more the distance from the ground to
wheel rim and as long as that is positive he should be safe for just
about anything.

Wayne

----- Original Message -----
From: "Bob Patterson" <beep@sympatico.ca>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 8:34 PM
Subject: Re: Tailwheel / prop clearance

Hi Wayne !

Maybe you still have the old Super Rebel gear ??? The Moose gear
legs are a fair bit longer than the S-R legs - for good reason ! ;-)
We usually took off a bit tail-low, and I never wheel-landed (it
3-points
very nicely!! ) Going to larger diameter main tires can cause lots
of other problems - those huge 'tundra tires' added lots of loads, and
made landings "interesting" !

.....bobp

----------------------------orig.-------------------
On Monday 24 May 2004 08:14 pm, you wrote:
At least you don't have the 106-1/4" prop like me for the M462!
Going to require some BIG tires or gear leg extensions for wheel
flying if I
complete
going that route.

With the airplanes tail lifted into a level flight attitude, or
slightly nose down to cover wheel landings, you should have a
minimum or 9" prop
tip
clearance to be safe in a tail dragger.

To simulate a flat tire, park a main tire up on some boards that are
the matching thickness of the dimension from the ground to the
bottom edge
of
the wheel rim. Then lift the tail wheel up in the air in level
flight
(or
slightly nose down to simulate a wheel landing). This will then
simulate
a
flat tire if you measure from the prop tip in it's lowest part of
the
arc
and then subtract the full measurement of the boards. MUST have a
positive #
to guarantee tip clearance.

Cheers,
Wayne

----- Original Message -----
From: "Ted Waltman" <tedwaltman@i1ci.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 7:54 PM
Subject: RE: Tailwheel / prop clearance

18" is for a Moose, 92" Hartzell 3-blade prop, stopped on the
ground with the std MAM tailwheel. I'm just thinking of how the
prop
clearance
is reduced during takeoff (pushing the tail up a bit as one gets
going)
and during any sort of a wheel landing. A hangar mate has a 185
with
a
3-blade and his prop clearance was (I think) 24" (or more).

Thanks,

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf
Of Legeorgen@aol.com
Sent: Monday, May 24, 2004 5:47 PM
To: murphy-rebel@dcsol.com
Subject: Re: Tailwheel / prop clearance


Ted,

Rebel or a Moose? 18" sounds like a lot even for a Moose. Did you
measure it in a flight level attitude?

I have a Rebel 0320 with a Scott 3200 tailwheel and It handles
very well. I never even unwrapped the MAM tailwheel form its
plastic.

Bruce



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Wayne G. O'Shea

9" number for wheel guide?

Post by Wayne G. O'Shea » Sat Feb 18, 2012 9:16 am

9" is an FAA standard for FAR 23 certification... that is there to cover a
flat tire, gear deflection etc. Worse case is a flat tire and full
deflection of a gear leg that must give a positive clearance (with no
mininum specified).

Wayne

----- Original Message -----
From: "Ted Waltman" <tedwaltman@i1ci.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 10:41 PM
Subject: 9" number for wheel guide?

Ok, I have to ask where the 9" recommended # comes from.

Also, what's the maximum potential "give" on the mains in the event of a
hard landing (not by me of course--just theoretically)?

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne G. O'Shea
Sent: Monday, May 24, 2004 6:48 PM
To: murphy-rebel@dcsol.com
Subject: Re: Tailwheel / prop clearance


No, I do have the newer 3500 legs (and use the 2500 legs as forks on my
backhoe bucket for moving pallets around the yard!). I have no idea of
what I will have for prop clearance and not too concerned at this point
...as I may not be using MAM's gear legs anyhow. You know me better than
that and my "liking" for spring gear (on ANY airplane)! :o)

I may be wrong, but I was lead to believe that the two blade M14 prop
(like Bill brought to show us last week!) was only about 94 or 96" long.
It's the M462RF's 2 blade metal prop that I have.. that is 106-1/4" long
and pretty sure we discussed it before as being at least 10 inches
longer than the 2 blade that MAM originally ran on the Prototype.

As long as Ted jacks the tail up and gets more than 9" he should be good
to go. Subtract from the 9" or more the distance from the ground to
wheel rim and as long as that is positive he should be safe for just
about anything.

Wayne

----- Original Message -----
From: "Bob Patterson" <beep@sympatico.ca>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 8:34 PM
Subject: Re: Tailwheel / prop clearance

Hi Wayne !

Maybe you still have the old Super Rebel gear ??? The Moose gear
legs are a fair bit longer than the S-R legs - for good reason ! ;-)
We usually took off a bit tail-low, and I never wheel-landed (it
3-points
very nicely!! ) Going to larger diameter main tires can cause lots
of other problems - those huge 'tundra tires' added lots of loads, and
made landings "interesting" !

.....bobp

----------------------------orig.-------------------
On Monday 24 May 2004 08:14 pm, you wrote:
At least you don't have the 106-1/4" prop like me for the M462!
Going to require some BIG tires or gear leg extensions for wheel
flying if I
complete
going that route.

With the airplanes tail lifted into a level flight attitude, or
slightly nose down to cover wheel landings, you should have a
minimum or 9" prop
tip
clearance to be safe in a tail dragger.

To simulate a flat tire, park a main tire up on some boards that are
the matching thickness of the dimension from the ground to the
bottom edge
of
the wheel rim. Then lift the tail wheel up in the air in level
flight
(or
slightly nose down to simulate a wheel landing). This will then
simulate
a
flat tire if you measure from the prop tip in it's lowest part of
the
arc
and then subtract the full measurement of the boards. MUST have a
positive #
to guarantee tip clearance.

Cheers,
Wayne

----- Original Message -----
From: "Ted Waltman" <tedwaltman@i1ci.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 7:54 PM
Subject: RE: Tailwheel / prop clearance

clearance
going)
a
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